1. First Irish 2+2

2. See also

3. References

A 2+2 road is a specific type of dual-carriageway being built in Ireland^[1] and in Sweden^[2] and in Finland,^[3] consisting of two lanes in each direction separated by a steel cable barrier.

These roads do not have hard shoulders and therefore they cannot be designated as Motorway at some future date. However, they may be designated as limited-access roads in the future as exspressways do not require the physical standard to be designated. The Irish variant, however, has {{convert|3.5|metre|ft|adj=mid|-wide}} lanes^[4] where there are a number of Swedish variants^[5] some with {{convert|3.25|metre|ft|adj=mid|-wide}} lanes.

Junctions are generally at-grade roundabouts and minor roads cross under or over the mainline without connecting. They are also known as "Type 2 dual-carriageways" by the Irish National Roads Authority. These roads look similar to expressways, except that expressways often have interchanges, large medians or concrete barriers between traffic. The United States has {{convert|80000|km|mi}} of roads that fit this description{{Citation needed|date=September 2008}}.

First Irish 2+2

In Ireland first purpose built road of this type opened in December 2007^[6][7] as a new greenfield section of the N4 national primary route which joins Dublin to Sligo.

See also

• 2+1 road
• Limited-access road

References

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